To change an object's state a Force must act on the object .Force is a quantity that acts on object to perform a task . For examples a pulling or pushing Force used to move the table . Force used to break a piece of wood

To make an object accelerates, a force must act on the object. This force is found to be proportional to the object's mass and acceleration:

The gravitational force of the Earth acts on any object above the earth is directly proportional to the mass of the Earth and the mass of the object and inversely proportional to the square of the distance between the Earth and the object.